Concrete mixer



c. H. SCOTT CONCRETE MIXER Nov. 26, 1929.

2 Sheets-Sheet Filed Dec. 3, 1928 ||l|ll||||llllllll|lIIIIIIIIIIILIPIIIIIIL INVENTOR 6211-2 [elf 5 7f WITNESSES ATTO RNEY C. H. SCOTT CONCRETE MIXER Nov. 26, 1929.

Filed Dec. 1928 2 Sheets-Sheet 2 i Z, INVENTOR W 5 ATTORNEY Patented Nov. 26, 1929 UNITEDv STATES CARLYLE H. SCOTT, OF NEW YORK, N. Y.

concan'rn MIX/ER Application filed December a, 192 s. semi 1%. 823,887.

This invention relates to concrete mixers, and particularlyto an improved mixer permanently mounted on a truck so that it Wlll act both in the capacity of a mixer and a transporting tank. I

Another object of the invention is to provide in a concrete mixer a mixing structure which, when operated in one direction, will mix the sand, cement and other parts of the conglomerate and when in another position will propel the mixed concrete to a discharge oint.

An additional object is to provide in a concrete mixer means for first mixing the conglomerate and then mixing water therewith immediately before discharge of the batch.

Another object is to provide a concrete mixer permanently mounted on a truck with means for mixing the concrete while the truck is standing still or moving with means for utilizing the exhaust from the engine of the truck to maintain the batch warm during a mixing operation.

In the accompanying drawings,- a

Figure 1 is a side view of a concrete mixer disclosing an embodiment of the invention, certain partsbeing broken away;

Figure 2 is an end view of the structure shown in Figure 1;

Figure 3 is a longitudinal vertical sectional view through one of the discharge ports or outlets of the mixer shown in Figure 1;

Figure 4 is a sectional view through Figure 3'0n the line 14;

Figure 5 is a longitudinal vertical sectional view through part of the mixer shown in Figure 1, the same being on a somewhat enlarged scale;

Figure 6 is a detail fragmentary sectional view through Figure 5 approximately on the line 6-6, certain parts eing broken away with the remaining part showing the mixing and propelling mechanism;

Figure 7 is an enlarged to plan view of the inlet opening shown in Flgure 1;

Figure 8 is a sectional view through Fig ure 7 on the line 8'-8.

Referring to the accompanying drawings by numerals, 1 indicates a tubular tank which is preferably provided with an end 2 riveted or integrally formed with the body of the tank. The end 3 opposite end 2 is preferably removable, though this is not absolutely essential. By making the end 3 removable the rotating parts shown articularly in Figures 5 and 6 may be readi y applied or removed or may be readily adjusted or repaired at any time. The tank 1 is adapted to be substantially permanently mounted on a truck of any desired kind and preferably the exhaust from the truck is connected with pipe 4, said pipe 4 discharging into the chamber 5 which is formed beneath, tank 1 b reason of the casing or apron 6. Suitab e openings are provided for chamber 5 so that the exhaust discharged therein may escape but before escaping causes the parts to become heated, whereby concrete may be properly mixed even in very cold weather. The truck carrying the tank 1 may be any desired kind of a truck provided with an internal combustion engine. Also, in trucks as now made there is provided a power take-off mechanism which may be reversed. To the power take-off mechanism of the truck is applied a chain 7 adapted to be driven thereby so that the chain may drive a sprocket 8 rigidly secured to the shaft 9. In this way the shaft 9 may be rotated or allowed to remain stationary while the truck is traveling or while the truck'is standing still. Connected with the shaft 9 is a spiral structure 10 which, when shaft 9 is rotated in one direction, will act as a mixing or stirring device and when the shaft is rotated in the 0p osite direction will act as a screw or propel ingdevice for forcing the batch out through the discharge outlet 11. If preferred, the batch could be discharged out through the outlet 12. The outlets 11' and 12 are identical and are each provided 90 with a flange 13, whereby they may be connected to a pi e, chute or other means for directing the atch to a desired point. A suitable knife valve 14 is provided, said valve being pivotally mounted at 15 and having 95 a hand hold 16, whereby the valve may be readily opened and closed. Referring again to shaft 9 it will be noted from Figures 1 and 5 that the same is supported by suitable bearings 17 and 18 at the respective ends of 1 the tank 1.- This tank at the upper part is provided with an inlet member 19 desi ed to permit the insertion of matter to be mixed when open. The inlet 19 consists principally of an upstanding flange 20 secured to or formed integral with the tank 1 and is provided with a Usshaped'channel portion 21 accommodating the sliding valve 22. This valve is provided with a hand hold 24 whereby the valve may be slid back and forth to an open and closed position. When mixing concrete the cement, sand and other matter are thoroughly mixed. After this has been done the mixture is left in place and'transported in the 'tank 1, to the place where it is to be used. A short time before the mixture is to be used water'is discharged from one of the tanks 26 and then the mixing structure 10 operated for a desired time until the water has been thoroughly brought into contact with the mixture. The mixing device 10 is then reversed, and in reversing the same 'it aut'omatically becomes a screw, so that the mixed batch is then forced out through one of the outlets 11 and 12, the valve or gate 14 being open for this purpose. By this method the concrete is mixed during the time it is transoutlets.

ported from the yard to the place where it is to be used. Also, it will be noted that" the water is admitted only a short time before the batch is to be discharged so that the batch will not be cooked or undesirably acted on by the water. It will be noted from Figure 2 that the tanks 25 and 26 are connected to the tank 1 so as to discharge therein through pipes 27 and 28 and these pipes in turn are controlled bythe valves 29 and 30. Preferably the water from one tank is sufficient to provide the desired moisture for the batch in tank 1, and after this batch has been discharged the water from the other tank is discharged into the tank 1, the outlets being closed. The stirring device 10 is thenoperated, whereby the parts are washed and after the washingoperation the water and other matter are forced out of one of the outlets. The mixing device 10 as heretofore mentioned acts to mix the batch both when dry and when wet, and in addition, acts as means for propelling or forcing the batch out through one of the discharge outlets. In order to accomplish this the mixing device 10 comprises a screw 31, a shaft 32 and gates 33.

The gates 33 automatically move to a closed position when the device is actingas a screw for forcing the batch out through one of the When the shaft 32 is reversed the various gates 33 automatically open and then the device acts as a stirring structure for stirring and mixing the batch while in a dry over shaft 35. This shaft is slightly larger,

at the inner end so as to provide a shoulder on which the looped members 36 may rest.

From Figure 5 itwill be noted that the door sections 34, slightly overlap certain parts of the screw 31 when'the gates are closed and are moved automatically to an open position, as shown by dotted lines in Figure 5 when the device is acting as a stirring structure.

vA projection 38 is provided on each of the shafts 35, said projections acting as stops for various door sections 34. 'When shaft 32 is rotating in one direction it acts as a screw and when it is rotating in the opposite direction it acts with the sections 34 as a mixing device. As this shaft carries a sprocket wheel 8, chain 7 may function to rotate the shaft in either direction. As mentioned heretofore,

chain 7 is connected with the usual power take-ofl of a truck and may be operated in either direction, as well as at'any time.

What I claim is 1. A concrete mixer, comprisilng a closed tank provided with means acting as an inlet .and means acting as an outlet, means for directing water into the tank and a mixing device arranged in the tank, said mixing device comprising a spiral screw and a lurahty of gates carried by t e screwforme to automatically close when the screw is moved inone direction and to automatically 0 en when the screw is moved in the. opposite ection.

, 2. A concrete mixer, comprising a tank and a mixing structure arranged in the tankfsaid mixing structure including a'shaft, a screw mounted on the shaft, said screw having a plurality of radially-extendin openings, a gate arranged adjacent each o the openings and means for pivotally mounting the respective gates and holding them in said positions so that when said shaft is rotated in one direction the gates will line up with the screw and cause the screw formation and when the shaft is rotated in the opposite direction said gates will automatically move to an open position for permitting the matter being mixed to be properly stirred.

3. A concrete mixer, comprising a container and a device arranged in the container for mixin a batch therein, said device including as aft, a screw mounted on the shaft, said screw having a number of gateways therein, a door sect1on for each gateway, each of said door sections overlapping at each edge closed, a radially-extending shaft for' each portion of the screw when the door section is of said door sections, said radially-extending shafts being rigidly secured to the firstmentioned shaft, means carried by the door sections loosel extending sha ts, and a sto on each of the radially-extending shafts or limiting the v swinging movement of the door sections around the radially-extending shafts.

4. In a concrete mixer, a mixing structure comprising a rotatable shaft, a screw secured to said shaft, said screw having a plurality of gateways, a radially-extendin shaft for each of said gateways, said shafts eing positioned substantially centrally of the gateways, a door section pivotally mounted on each of said radiall -extending shafts, said door sections being ormed to close the gateways when moved to a certain position, and :1 stop on each of said radially-extending shafts for limiting the rotary movement of the door sections.

Signed at New York in the county of New York and State of New York this 28th day of November A. D. 1928.

CARLYLE H. SCOTT.

surrounding said radially-. 

